JP2014081103A - Liquid storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid storage tank having high resistance to a negative pressure.SOLUTION: In a liquid storage tank which includes: a cylindrical barrel portion; an upper barrelhead closing an upper end of the barrel portion; and a lower barrelhead closing a lower end of the barrel portion, and in which a plurality of reinforcement portions are circumferentially disposed on the barrel portion, intervals of the reinforcement portions become gradually longer as its goes downward and become gradually shorter as its goes upward. As the plurality of reinforcement portions are formed on the barrel portion of the liquid storage tank, and the intervals of the reinforcement portions are determined to be gradually longer as its goes downward and gradually shorter as it goes upward, deformation toward the inside can be surely prevented as the intervals of the reinforcement portions become shorter as its goes upward, though resistance to deformation to the inside, is weakened as it goes upward in relation to a head pressure by the negative pressure in a full state of the liquid storage tank, and the liquid storage tank can be constantly used in safety.

Description

  The present invention relates to a tank for storing a liquid, and particularly to a liquid storage tank for an electric water heater or a heat pump type hot water heater.

  Conventionally, in this kind of liquid storage tank, three ring-shaped reinforcing metal fittings are welded at equal intervals on the inside of the body, and the liquid storage tank is going to deform inward under negative pressure. It was something to prevent. (See Patent Document 1.)

Japanese Utility Model Publication No. 62-76863

  By the way, in this conventional type, since the reinforcing ring is fixed to the body portion by welding, crevice corrosion is caused in the portion between the reinforcing ring and the body portion, and the service life is shortened. Since it is made of a material, the cost increases, and the liquid storage tank is filled with liquid storage, and water head pressure is applied to the outside of the storage tank. Since it becomes weaker, if the reinforcing rings are provided at equal intervals in the body, there is a problem that the entire liquid storage tank cannot be uniformly protected from negative pressure due to the head pressure.

  The present invention focuses on this point and solves the above-described problems. In particular, the configuration includes a cylindrical body, an upper end panel that closes the upper end of the body, and a lower end panel that closes the lower end of the body. In the liquid storage tank in which a plurality of reinforcing portions are provided in the circumferential direction in the body portion, the interval between the reinforcing portions is longer in the lower direction and shorter in the upward direction. It is.

  According to a second aspect of the present invention, the reinforcing portion is a protruding bead formed integrally with the body portion.

  As described above, according to the present invention, a plurality of reinforcing portions are formed in the body portion of the liquid storage tank, and the interval between the reinforcing portions is longer and lower as it goes upward. In relation to the water head pressure due to the negative pressure when the storage tank is full, even if it is weaker to the inner deformation as it goes upward, the interval between the reinforcing parts is shortened as it goes upward. It can prevent deformation and can always be used with confidence.

  Further, according to claim 2, since the reinforcing portion is a protruding bead formed integrally with the body portion, there is no welded portion, so there is no concern about crevice corrosion and it can withstand long-term use. It can be formed easily and can be provided at low cost.

The schematic block diagram of the liquid storage tank of one Embodiment of this invention. Explanatory drawing of the water head pressure of the same storage tank. The expanded sectional view of the principal part.

Next, an embodiment of the present invention will be described with reference to a hot water supply and thin stainless steel liquid storage tank.
Reference numeral 1 denotes a cylindrical body, the upper end of which is closed by welding an arc-shaped upper end plate 2, and the lower end of which is also closed by welding an arc-shaped lower end plate 3.
A hot water pipe 4 connected to the top of the upper end plate 2 is used to discharge hot water stored in the tank by opening a hot water tap (not shown) provided at a hot water supply location.
Reference numeral 5 denotes a water supply pipe connected to the lowest part of the lower end panel 3. The water supply discharged from the hot water discharge pipe 4 is supplemented with the supply pressure of city water to keep the tank full. .

  Reference numeral 6 denotes a protruding bead constituting a plurality of reinforcing portions provided in the circumferential direction of the body 1, and three protruding beads 6 are provided so as to protrude integrally toward the outside of the body 1. The interval between each protruding bead 6 is longer and lower as it goes upward, that is, the interval L1 between the lowest protruding bead 6A and the protruding bead 6B above, and the protruding bead 6B and above it. The distance L2 between the protruding beads 6C is longer than the distance L1, and the distance L1> the distance L2, and the widths and protruding lengths of the protruding beads 6A, 6B, 6C are the same.

Next, the operation of this embodiment will be described. Before that, the liquid storage tank is composed of an electric heater (not shown) provided in the tank or a heat pump device (not shown) provided outside the tank. The water in the liquid storage tank is heated to the specified temperature and heated to the full temperature.
Also, as shown in Fig. 2, the liquid storage tank that is full and erected in the up-down direction has a water head pressure toward the outside of the tank that is much higher at the bottom of the tank than at the top and decreases as it goes up It is.

  Therefore, when a negative pressure that deforms the tank inward due to water breakage or the like acts on the full liquid storage tank, a protruding bead 6 is formed on the body 1 as a reinforcing portion, and each protruding bead 6A , 6B, 6C, the distance L1 between the lower protruding beads 6A and 6B having a high head pressure is increased, and the distance L2 between the upper protruding beads 6B and 6C having a lower head pressure is shortened. Thus, the deformation of the body portion 1 due to the negative pressure can be surely and uniformly prevented as a whole, and by obtaining the strong body portion 1, the liquid storage tank can always be used with peace of mind.

  The upper end plate 2 and the lower end plate 3 are formed in a circular arc shape in advance, so that the pressure resistance against negative pressure is strong and there is no need to reinforce, and the body portion 1 in which a thin plate is wound into a cylindrical shape is weak against pressure resistance. Reinforcement here was necessary.

DESCRIPTION OF SYMBOLS 1 Body part 2 Upper end plate 3 Lower end plate 4 Outlet pipe 5 Water supply pipe 6 Projection bead (reinforcement part)
L1, L2 interval

Claims (2)

  A cylindrical barrel, an upper end plate that closes the upper end of the barrel, and a lower end plate that closes the lower end of the barrel, and a plurality of reinforcing portions are provided in the circumferential direction on the barrel. In the liquid storage tank, the space between the reinforcing portions is longer in the lower direction and shorter in the upper direction.   2. The liquid storage tank according to claim 1, wherein the reinforcing portion is a protruding bead formed integrally with the body portion.

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